gecko-dev/layout/docs/css-gap-decorations/examples/grid-align-001.html

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<!doctype html>
<!--
Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/
-->
<title>Examples of 'row-rule-align' values.</title>
<style>
html,body {
color:black; background-color:white; font:20px/1 monospace;
}
.grid {
position: relative;
display: inline-grid;
grid-template-columns: 1ch 2ch 2ch;
gap: 10px 30px;
block-size: calc(2em + 30px);
inline-size: calc(10ch + 30px);
place-content: center;
column-rule: 6px solid cyan;
column-rule-extent: all-long;
column-rule-lateral-inset-start: 20%;
row-rule: 6px solid purple;
row-rule-longitudinal-inset: 1px;
border: 2px solid;
margin-right: 15px;
margin-bottom: 30px;
background: lightgrey;
}
.test1 { row-rule-align: gap-center; }
.test2 { row-rule-align: gap gap-over; }
.test3 { row-rule-align: rule; }
.test4 { row-rule-align: rule-center; }
.test5 { row-rule-align: gap rule-over; }
.test6 { row-rule-align: gap-over gap; }
x {
background: grey;
}
x:nth-child(3) {
grid-row: span 2;
}
.grid::after {
position: absolute;
bottom: -1.5em;
width: 400px;
font-size: 10px;
vertical-align: top;
content: attr(test);
}
pre { font-size: 10px; }
</style>
<pre>Note that the row rules all have a 1px longitudinal inset
to separate the individual rule segments. ('rule-center',
for example, would otherwise look like one long rule)
Note also that the column rule is intentionally not centered in
the gap (to separate 'rule-center' from 'gap-center').
</pre>
<div class="grid test1"><x>1</x><x>2</x><x>3</x><x>4</x><x>5</x></div>
<div class="grid test2"><x>1</x><x>2</x><x>3</x><x>4</x><x>5</x></div><br>
<div class="grid test3"><x>1</x><x>2</x><x>3</x><x>4</x><x>5</x></div>
<div class="grid test4"><x>1</x><x>2</x><x>3</x><x>4</x><x>5</x></div><br>
<div class="grid test5"><x>1</x><x>2</x><x>3</x><x>4</x><x>5</x></div>
<div class="grid test6"><x>1</x><x>2</x><x>3</x><x>4</x><x>5</x></div><br>
<script>
window.onload = function() {
[...document.querySelectorAll('div')].forEach(function(elm) {
const cs = window.getComputedStyle(elm);
elm.setAttribute("test",
"row-rule-align:" + cs.rowRuleAlign
);
});
}
</script>